Brakes Acting Up

[tyler]

Not knowing how you bled the rear...I have only had success with gravity bleeding the rear - slow but consistent. Put an upward curve or loop of clear
hose on one rear bleed port at a time and let it sit for a few hours or long enough to significantly drop in the master cylinder. Refill and do the
next one.
--
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC

 

[michael1]

I have a very similar situation.
Firm pedal - engine off
Semi-firm with engine running, but the pedal does not return and I can feel the brakes dragging.
The rubber gasket on the booster is dried out, I already replaced the elbow and that improved it some.
If I wiggle the elbow so air does not leak past the gasket, the pedal returns to full height.

I could be wrong, since I have not replaced the rubber gasket, but I think that slight air leak is what is keeping the pedal from returning. Which I
will now add to my "Isolation Shopping List"

On a similar note, a friend just had the booster replaced in her truck, they did not touch the brake lines.
Her pedal would not return and the brakes dragged.
The pedal stayed depressed to the point that it activated her brake lights, causing the battery to drain overnight.

My vote: Brake Vacuum Booster
--
1973 GMC 26' Glacier - Unknown Mileage - Has a new switch pitch transmission with Powerdrive

 

[terry1]

My first thought from the original posting was defective/broken brake booster. Still think that is the culprit.
--
Terry Kelpien

ASE Master Technician

73 Glacier 260

Smithfield, Va.

 

[terry1]

Take the master off the booster without disconnecting the lines, depress the piston, and see if it returns all the way every time.
--
Terry Kelpien

ASE Master Technician

73 Glacier 260

Smithfield, Va.